US4662780A - Method for docking of a floating structure - Google Patents

Method for docking of a floating structure Download PDF

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Publication number
US4662780A
US4662780A US06/790,118 US79011885A US4662780A US 4662780 A US4662780 A US 4662780A US 79011885 A US79011885 A US 79011885A US 4662780 A US4662780 A US 4662780A
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US
United States
Prior art keywords
pit
level
sea
water
dike
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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US06/790,118
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English (en)
Inventor
Ola O. Thorsnes
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Selvaagbygg AS
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Selvaagbygg AS
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Assigned to SELVAAG-BYGG A/S, HOLMENVEIEN 19, N-03 OSLO 3, NORWAY, A CORP OF reassignment SELVAAG-BYGG A/S, HOLMENVEIEN 19, N-03 OSLO 3, NORWAY, A CORP OF ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: THORSNES, OLA O.
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Publication of US4662780A publication Critical patent/US4662780A/en
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Expired - Fee Related legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
    • E02B17/025—Reinforced concrete structures

Definitions

  • the present invention relates to a method for docking of a floating structure, e.g. a concrete offshore platform, as indicated in the preamble of the appended independent claims.
  • the lower part of the concrete platform is first built in a dry dock, the dock being built by making a dike, e.g. in a fjord arm or in an area of loose gravel or sand deposits adjacent the sea, whereupon the water inside the dike is pumped dry.
  • the lower part of the concrete platform is then erected until its size provides sufficient buoyancy to permit removing the dock port and floating the platform to a deeper place, whereupon the further erection of the concrete platform takes place while it is gradually lowered into the water as the work proceedes.
  • the present invention aims at reducing or avoiding some of the problems related to the known method, the platform being built at a site where the land area adjacent the sea generally consists of gravel or sand deposits.
  • FIGS. 1-3 illustrate a first solution according to the invention
  • FIGS. 4-6 illustrate a second solution according to the invention.
  • FIG. 1 shows a land area 1 adjacent the sea 2.
  • a pit 3 is excavated, whereby a dike 4 is formed protecting the pit from the sea 2.
  • the pit 3 is excavated from a first level 5 down to a second level 6, the first level 5 lying, or being brought to lie, some distance above the maximum level of the sea 2.
  • the pit 3 In order to prevent slipping of the masses, the pit 3 must be sloped along the edges and the bottom width of the pit must be sufficiently large to provide free access for constructions machinery etc. to the concrete structure to be built.
  • the floating structure 7, e.g. in the form of said concrete platform, is erected from the bottom 6 of the pit 3 and it may be erected to a level lying above the cell structure of the concrete platform.
  • the distance between the first and second levels may be 7 meters. Thereafter the depth of the pit is increased by building a dike 8 from said first level 5 to a third level 9. The distance between said first level and said third level may for example be 10 meters. In the chosen example the pit has thus been given a total depth of 17 meters.
  • the pit 3 is filled with water to a level 11 until the structure floats in the pit 3.
  • the level 11 may correspond approximately to the level 9.
  • the dike 4; 8 now separates the water filled pit from the sea 2 on the outside. While the water in the pit 3 is held at said level 11, the deposits 12 situated in the existing pit 3 and thus under the floating structure, are pumped out or in other ways removed by means of conventional techniques, so that the depth of the pit 3 is increased down to a fourth level 13, which in the chosen example lies about 10 meters below said second level 6.
  • the water level in the pit 3 is lowered to a fifth level 14, corresponding to the level of the sea 2 on the outside. Thereafter the dike 4; 8 is removed, whereupon the floating structure 7 may be floated from the building site.
  • FIGS. 4-6 show an alternative embodiment according to the invention, where the floating structure is built at a greater distance from the sea than in the embodiment according to FIGS. 1-3.
  • a pit 3 is first excavated from a first level 5 down to a second level 6, whereupon the structure 7 is erected completely or partly in the pit 3.
  • the level 6 may for example be 7 meters below the level of the sea 2.
  • a second pit 15 is excavated, this pit being deeper than the pit 3 and being open towards the pit 3, as indicated in FIGS. 5 and 6.
  • the bottom of the pit 15 will be at a third level 16 which is lower than the level 6, for example 10 meters lower.
  • both pits 3 and 15 are increased by building the continuous upper edge of the pits up to a fourth level 17.
  • the level 17 may lie somewhat above the surface of the sea 2, for example about 10 meters.
  • both pits 3 and 15 are filled with water 23 up to a level 18, which is sufficient for the floating structure 7 to clear the bottom 6 of the pit 3.
  • the level 18 may be approximately the same as the level 17.
  • the structure is floated over to the pit 15, whereupon the water in both pits is lowered to a fifth level 19 corresponding to the level of the sea 2 on the outside.
  • the land masses delimiting the pit 15 are generally designated by reference numeral 20, these masses forming a dike against the sea on the outside.
  • this dike 20 consists of the original dike 21 and the upper dike part 22, i.e. between the levels 5 and 17, as is apparent from FIG. 5.
  • the dike 20 is removed, whereupon the structure may be floated out.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Catching Or Destruction (AREA)
  • Building Environments (AREA)
  • Foundations (AREA)
US06/790,118 1983-06-09 1985-10-22 Method for docking of a floating structure Expired - Fee Related US4662780A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO832105A NO155109C (no) 1983-06-09 1983-06-09 Fremgangsmaate ved bygging av en flytende konstruksjon.

Publications (1)

Publication Number Publication Date
US4662780A true US4662780A (en) 1987-05-05

Family

ID=19887124

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/790,118 Expired - Fee Related US4662780A (en) 1983-06-09 1985-10-22 Method for docking of a floating structure

Country Status (3)

Country Link
US (1) US4662780A (no)
AU (1) AU568781B2 (no)
NO (2) NO155109C (no)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5462243A (en) * 1994-02-09 1995-10-31 Hart; Raymond F. Aircraft passenger window maintenance shield
EP1621233A2 (de) 2004-07-05 2006-02-01 Blücher GmbH Textiles Verbundmaterial mit Aktivkohlefasern und Verfahren zu seiner Herstellung
US20190002066A1 (en) * 2016-01-27 2019-01-03 Greendock Project Development B.V. Dry dock for building and/or dismantling navel structures

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US826096A (en) * 1905-11-11 1906-07-17 Bucyrus Co Excavating machinery.
CA616782A (en) * 1961-03-21 Christiani And Nielsen Injecting sand under subaqueous foundations
US3466878A (en) * 1966-01-17 1969-09-16 Boussiron Soc Entreprises Rig for work at sea,in lakes,lagoons
US3526096A (en) * 1968-12-11 1970-09-01 Morrison Knudsen Co Method of making rockfill foundations
US3911687A (en) * 1972-05-02 1975-10-14 Olav Mo Foundation method for caissons
US4193714A (en) * 1978-07-24 1980-03-18 A/S Hoyer-Ellefsen Method for erecting a deck on a marine structure
JPS58120912A (ja) * 1982-01-14 1983-07-19 Nippon Kokan Kk <Nkk> セミサブリグの建造法
US4422803A (en) * 1981-11-30 1983-12-27 Global Marine, Inc. Stacked concrete marine structure
US4482274A (en) * 1980-07-15 1984-11-13 Tecnomare, S.P.A. Floating platform for use in deep waters, and method of installation
US4534678A (en) * 1982-02-24 1985-08-13 Sumitomo Metal Industries, Ltd. Offshore structure and method of constructing same
US4555201A (en) * 1983-11-14 1985-11-26 Paoluccio John A Sediment dike apparatus and methods

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA616782A (en) * 1961-03-21 Christiani And Nielsen Injecting sand under subaqueous foundations
US826096A (en) * 1905-11-11 1906-07-17 Bucyrus Co Excavating machinery.
US3466878A (en) * 1966-01-17 1969-09-16 Boussiron Soc Entreprises Rig for work at sea,in lakes,lagoons
US3526096A (en) * 1968-12-11 1970-09-01 Morrison Knudsen Co Method of making rockfill foundations
US3911687A (en) * 1972-05-02 1975-10-14 Olav Mo Foundation method for caissons
US4193714A (en) * 1978-07-24 1980-03-18 A/S Hoyer-Ellefsen Method for erecting a deck on a marine structure
US4482274A (en) * 1980-07-15 1984-11-13 Tecnomare, S.P.A. Floating platform for use in deep waters, and method of installation
US4422803A (en) * 1981-11-30 1983-12-27 Global Marine, Inc. Stacked concrete marine structure
JPS58120912A (ja) * 1982-01-14 1983-07-19 Nippon Kokan Kk <Nkk> セミサブリグの建造法
US4534678A (en) * 1982-02-24 1985-08-13 Sumitomo Metal Industries, Ltd. Offshore structure and method of constructing same
US4555201A (en) * 1983-11-14 1985-11-26 Paoluccio John A Sediment dike apparatus and methods

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5462243A (en) * 1994-02-09 1995-10-31 Hart; Raymond F. Aircraft passenger window maintenance shield
EP1621233A2 (de) 2004-07-05 2006-02-01 Blücher GmbH Textiles Verbundmaterial mit Aktivkohlefasern und Verfahren zu seiner Herstellung
US20190002066A1 (en) * 2016-01-27 2019-01-03 Greendock Project Development B.V. Dry dock for building and/or dismantling navel structures
US10913520B2 (en) * 2016-01-27 2021-02-09 Greendock Project Development B.V. Dry dock for building and/or dismantling navel structures

Also Published As

Publication number Publication date
NO155109B (no) 1986-11-03
AU568781B2 (en) 1988-01-07
NO155109C (no) 1987-02-11
NO832105L (no) 1985-01-07
AU4924285A (en) 1987-05-14

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SELVAAG-BYGG A/S, HOLMENVEIEN 19, N-03 OSLO 3, NOR

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:THORSNES, OLA O.;REEL/FRAME:004471/0678

Effective date: 19851010

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 19910505